Anionic electrodeposition coating composition

Abstract

An anionic electrodeposition coating composition containing, as the heat curable resin components, (A) a water-dispersible vinyl copolymer having hydroxyl group, carboxyl group and an ester linkage modified by a lactone group compound and (B) a crosslinking agent.

What is claimed is: 
     
       1. An anionic electrodeposition matte coating composition containing, as the heat curable resin components, (A) a water-dispersible vinyl copolymer obtained by subjecting a hydroxyl group-containing vinyl monomer, a carboxyl group-containing vinyl monomer, a lactone-modified vinyl monomer containing a hydroxyl group and/or a carboxyl group and an alkoxysilyl group-containing vinyl monomer as essential monomer components to radical copolymerization, and having an acid value of 15 to 150, a hydroxy value of 30 to 200, an ester linkage modified by a lactone group compound and an alkoxysilyl group on its side chain, and (B) a melamine resin crosslinking agent, said water-dispersible vinyl copolymer (A) being in the range of 40 to 85% by weight, and said crosslinking agent (B) being in the range of 15 to 60% by weight based on a total weight of the copolymer (A) and the crosslinking agent (B).